Sloping sheet metal roof and roofing unit therefor

ABSTRACT

A sloping sheet metal roof includes a roofing pan having a lower end portion overlapping the upper end portion of a lower roofing pan, across the upper surface of which there is a connecting strip of sheet metal. The upper end of the lower pan is turned back upon itself to form a hook and the underside of the connecting strip is provided with a hook portion hooked into the pan hook. The upper end of the strip extends beyond the upper end of the lower pan and is formed to be fastened down to a support. At a point spaced from the lower edge of the connecting strip it is fastened to the underlying pan, and the lower end of the upper pan is turned back beneath itself to form a hook receiving the lower end of the connecting strip, whereby the pans are connected together.

Ullitg iii States n91 Boyd [ 1 Apr. 8, 1975 SLOPENG SHEET METAL ROOF ANDROOFING UNIT THEREFOR 221 Filed: Jan.25,1974

211 Appli No.: 436,664

[52] 1.1.8. Cl. 52/520; 52/530; 52/545 [51] Int. Cl E04d 1/06; E04d 1/18[58] Field of Search 52/518-522, 52/529-532, 545, 552. 556, 472, 544,478

[56] References Cited UNITED STATES PATENTS 362,118 5/1887 Sagendorph52/519 369,477 9/1887 Smeeton 52/520 1,107,568 8/1914 Bambergcr 52/5201,244,087 10/1917 Havens et a1. 52/520 2,126,676 8/1938 Thomas 52/5203,320,711 5/1967 .lohnson..... 52/552 3,552,078 1/1971 Mattes 52/5313.703,062 11/1972 McKinney 52/545 UPPER E/VD Primar E.\'aminerFrank L.Abbott Assistant Examiner.lames L. Ridgill, Jr. Attorney, Agent, orFirmBrown. Murray, Flick & Peckham [57] ABSTRACT A sloping sheet metalroof includes a roofing pan having a lower end portion overlapping theupper end portion of a lower roofing pan, across the upper surface ofwhich there is a connecting strip of sheet metal. The upper end of thelower pan is turned back upon itself to form a hook and the underside ofthe connecting strip is provided with a hook portion hooked into the panhook. The upper end of the strip extends beyond the upper end of thelower pan and is formed to be fastened down to a support. At a pointspaced from the lower edge of the connecting strip it is fastened to theunderlying pan, and the lower end of the upper pan is turned backbeneath itself to form a hook receiving the lower end of the connectingstrip, whereby the pans are connected together.

9 Claims, 3 Drawing Figures SLOPING SHEET METAL ROOF AND ROOFING UNITTHEREFOR In laying sloping sheet metal roofs made from overlapping metalpans, the pans are placed side by side and end to end, with the lowerend of each pan overlapping the upper end of the pan below it. Therealways is a problem of connecting the overlapping portions of the panstogether so that rain will not be blown up between them and leaks occur,especially when the roof has only a slight slope.

It is among the objects of this invention to provide a sloping sheetmetal roof, in which the overlapping pans can be quickly fastenedtogether, in which separate members are not required for fastening theoverlapping ends of the pans together as they are being laid down, andin which rain cannot be blown up between the overlapping ends of thepans.

The preferred embodiment of the invention is illustrated in theaccompanying drawings, in which FIG. 1 is a fragmentary plan view of theupper end of a roofing unit;

FIG. 2 is an enlarged fragmentary isometric view of a roof, partlybroken away in section and with the thickness of the metal exaggerated;and

FIG. 3 is a fragmentary longitudinal section through the overlappingportions of two roof units.

Referring to FIG. 1 of the drawings, a roofing unit is shown that iscomposed of a sheet metal pan 1, and a sheet metal connecting strip 2attached to the upper end portion of the pan. The pan is made anydesired length that can be handled conveniently and has upwardlyextending side flanges 3, the upper edges of which are provided withlaterally projecting lips 4. The connecting strip extends across theupper surfacee of the upper end portion of the pan and has upwardlyextending side flanges 5 engaging the inner surfaces of pan flanges 3.It also projects lengthwise from the end of the pan. The lower end ofthe pan is turned back beneath itself to form a hook 6.

As shown best in FIGS. 2 and 3, the upper end portion of the connectingstrip is folded back beneath itself so that this portion of the strip iscomposed of upper and lower layers engaging each'other. The lower end ofthe lower layer is again turned back beneath itself to form a hookportion 7 that is hooked into a book 8 formed by turning the upper endof the underlying pan back upon itself. The lower end portion of theconnecting strip is folded back against itself to provide a doublethickness portion that will stiffen this part of the strip. At a point afew inches from the lower edge of the strip it is secured to theunderlying pan by suitable fastening means, such as rivets 9. Betweenthese rivets and the lower end of the strip, the strip is offsetupwardly from the pan a distance substantially the same as the thicknessof the pan metal, The prefabricated connecting strip 2 is fastened tothe pan before the unit is taken up to the roof. This connecting of thetwo parts can be done at a factory, but is more likely to be done byworkmen on the ground at the job site.

When the roofing units are laid, they are laid like shingles from thelower edge of the roof upwardly. Thus, one of the units is placed on thesubstructure of the roof, which may be wooden panels 11 or even a metaldeck. The roof unit is disposed with its lower end at the lower end ofthe substructure. The projecting upper end of the connecting strip whichis at the upper end of the unit and was offset downwardly as shownbefore the strip was secured to the pan, is provided with holes throughwhich suitable fasteners, such as screws or nails 12, are driven inorder to fasten the strip to the deck. Since the pan is already securedto the connecting strip, it is held in position on the deck by means ofthe connecting strip and the nails.

Another roofing unit of the same construction as the one just describedis then laid on the deck with the lower end ofits pan 15 overlapping theconnecting strip 2. The side flanges 16 of this pan engage the innersurfaces of the connecting strip flanges 5. The nesting of the adjoiningends of the two pans is made possible by tapering each pan slightly fromits upper to its lower end. This can be done, even though the sheet fromwhich the pan is made is a perfect rectangle, by simply using metal thatotherwise would form the lips 4. That is, the lips of the pan arenarrower at their upper ends because the distance between the panflanges is greater at the upper end than at the lower end.

The hook 17 at the lower end of the upper pan is first located below thelower end of the connecting strip, and then the unit is moved up theslope of the roof to cause the hook to hook under the lower end of theconnecting strip. The connecting strip (not shown) at the upper end ofthe upper pan is then fastened to the deck in the same way as the firstconnecting strip, whereby the upper end of the upper-pan is held inplace by its connecting strip while the lower end of the upper pan isheld in place by its book 17 in engagement with the lower end of thelower connecting strip 2. As many roofing units can be connected to oneanother and to the deck in this manner as are required.

Laying the roofing units can be very fast, because the only fasteningmembers necessary are the nails 12 at the upper ends of the connectingstrips. In addition to this advantage, there is no danger of waterleakage. The nails or rivets are covered and concealed by an overlyingpan. The tops of the upstanding side flanges can be covered by battencaps if it is a battan roof. If a standing seam roof, the lips along thetops of the pan flanges at one side of a row of pans are turnedoutwardly to overlie the inturned lips on the adjoining flanges of thenext row of pans. After the roofing units have been laid, the lips areturned down and folded in the usual way to form locked weatherproofseams. The application of the connecting strips to the metal pans in themanner disclosed herein, and the hooking of the overlapping panstogether as shown, assure tight waterproof joints between the roofingunits. The joints also are strong and will not open up. The doublethickness lower end portion of connecting-strip 2 stiffens this part ofthe strip so that the wind will not lift and bend it, which could form aleakage path for rain and possibly break the strip due to repeatedflexing.

According to the provisions of the patent statutes, I have explained theprinciple of my invention and have illustrated and described what I nowconsider to represent its best embodiment. However, I desire to have itunderstood that, within the scope of the appended claims, the inventionmay be practiced otherwise than as specifically illustrated anddescribed.

I claim:

1. A sloping sheet metal roof comprising a roofing pan having a lowerend portion overlapping the upper end portion of a lower roofing pan, aconnecting strip of sheet metal extending across the upper surface ofthe upper end portion of the lower pan beneath the overlapping lower endportion of the upper pan, the upper end of the lower pan being turnedback upon itself to form a hook, the underside of the connecting stripbeing provided with a hook portion extending across it and hooked intosaid pan hook, the upper end of the strip extending beyond the upper endof the lower pan and adapted to be fastened down to a support, theconnecting strip extending downwardly past its hook portion inoverlapping relation with the lower pan, and means spaced from the loweredge of the connecting strip fastening the underlying pan and theoverlapping strip together, the lower end of the upper pan being turnedback beneath itself to form a hook receiving the lower end of theconnecting strip.

2. A sloping sheet metal roof according to claim 1, in which saidroofing pans have upwardly extending side flanges, and said connectingstrip has a flange at each side extending upwardly between the panflanges at that side.

3. A sloping sheet metal roof according to claim 1, in which the portionof said connecting strip between its lower edge and said fastening meansis spaced above said underlying pan to form a slot receiving saidlastmentioned hook.

4. A sloping sheet metal roof according to claim 1, in which the upperend of said connecting strip is folded back beneath itself to form alower layer, and the lower end of said lower layer is turned backbeneath itself to form said hook portion.

5. A sloping sheet metal roof according to claim 4, in which the lowerend of said connecting strip is folded back against itself to provide adouble thickness portion, and said fastening means connect said doublethickness portion to said underlying pan.

6. A roofing unit for a sloping sheet metal roof, comprising a sheetmetal roofing pan having upper and lower ends, said lower end beingturned back beneath itself to form a hook, a sheet metal connectingstrip extending across the upper surface of the upper end portion ofsaid pan, the upper end of the pan being turned back upon itself to forma hook, the underside of the connecting strip being provided with a hookportion extending across it and hooked into said upper pan hook, theupper end of the strip extending beyond the upper end of the pan andadapted to be fastened down to a support, the connecting strip extendingdownwardly past its hook portion in overlapping relation with the lowerpan, and means spaced from the lower edge of the connecting stripfastening said pan and the overlapping strip together, the portion ofthe connecting strip between its lower edge and said fastening meansbeing spaced above the pan to form a slot for receiving the hook on thelower end of another roofing pan when that pan overlaps said connectingstrip.

7. A roofing unit according to claim 6, in which the upper end of saidconnecting strip is folded back beneath itself to form a lower layer,and the lower end of said lower layer is turned back beneath itself toform said hook portion.

8. A roofing unit according to claim 6, in which the lower end of saidconnecting strip is folded back against itself ro provide a doublethickness portion, and said fastening means connect said doublethickness portion to said pan.

9. A roofing unit according to claim 6, in which said roofing pan hasupwardly extending side flanges, and said connecting strip has upwardlyextending side flanges engaging the inner surfaces of said pan flanges.

1. A sloping sheet metal roof comprising a roofing pan having a lowerend portion overlapping the upper end portion of a lower roofing pan, aconnecting strip of sheet metal extending across the upper surface ofthe upper end portion of the lower pan beneath the overlapping lower endportion of the upper pan, the upper end of the lower pan being turnedback upon itself to form a hook, the underside of the connecting stripbeing provided with a hook portion extending across it and hooked intosaid pan hook, the upper end of the strip extending beyond the upper endof the lower pan and adapted to be fastened down to a support, theconnecting strip extending downwardly past its hook portion inoverlapping relation with the lower pan, and means spaced from the loweredge of the connecting strip fastening the underlying pan and theoverlapping strip together, the lower end of the upper pan being turnedback beneath itself to form a hook receiving the lower end of theconnecting strip.
 2. A sloping sheet metal roof according to claim 1, inwhich said roofing pans have upwardly extending side flanges, and saidconnecting strip has a flange at each side extending upwardly betweenthe pan flanges at that side.
 3. A sloping sheet metal roof according toclaim 1, in which the portion of said connecting strip between its loweredge and said fastening means is spaced above said underlying pan toform a slot receiving said last-mentioned hook.
 4. A sloping sheet metalroof according to claim 1, in which the upper end of said connectingstrip is folded back beneath itself to form a lower layer, and the lowerend of said lower layer is turned back beneath itself to form said hookportion.
 5. A sloping sheet metal roof according to claim 4, in whichthe lower end of said connecting strip is folded back against itself toprovide a double thickness portion, and said fastening means connectsaid double thickness portion to said underlying pan.
 6. A roofing unitfor a sloping sheet metal roof, comprising a sheet metal roofing panhaving upper and lower ends, said lower end being turned back beneathitself to form a hook, a sheet metal connecting strip extending acrossthe upper surface of the upper end portion of said pan, the upper end ofthe pan being turned back upon itself to form a hook, the underside ofthe connecting strip being provided with a hook portion extending acrossit and hooked into said upper pan hook, the upper end of the stripextending beyond the upper end of the pan and adapted to be fasteneddown to a support, the connecting strip extending downwardly past itshook portion in overlapping relation with the lower pan, and meansspaced from the lower edge of the connecting strip fastening said panand the overlapping strip together, the portion of the connecting stripbetween its lower edge and said fastening means being spaced above thepan to form a slot for receiving the hook on the lower end of anotherroofing pan when that pan overlaps said connecting strip.
 7. A roofingunit according to claim 6, in which the upper end of said connectingstrip is folded back beneath itself to form a lower layer, and the lowerend of said lower layer is turned back beneath itself to form said hookportion.
 8. A roofing unit according to claim 6, in which the lower endof said connecting strip is folded back against itself ro provide adouble thickness portion, and said fastening means connect said doublethickness portion to said pan.
 9. A roofing unit according to claim 6,in which said roofing pan has upwardly extending side flanges, and saidconnecting strip has upwardly extending side flanges engaging the innersurfaces of said pan flanges.